keyboard freezing after El Capitan upgrade

I don't know if anyone is still running in to these issues, but I've just endured it, upgrading an old iMac to El Capitan and having all my bluetooth peripherals locked out.

I had a wiggly line thru' the bluetooth icon in the system tray.

I consulted my Mac expert, who maintains all my machines (we have plenty but most are a lot newer than the one in question), and he advised:

Remove plug from back of iMac. Not wall socket, from iMac. Hold power button for 5 seconds then plug back in and turn on.

I can confirm that this worked perfectly and bluetooth was restored.

Try resetting the SMC, to do so please follow the direction in iMac SMC and PRAM reset. You may need to attempt this 2-3 times. Post back with your results.

The keyboard may be the problem, to know for sure, test with another keyboard. If it works okay then you know the original keyboard is having an issue.

Hi. I am having exactly the same behavior on a iMac and it started just a few days after upgrading the computer to El Capitan. It is strange that it is just a loose battery problem, why is it related with the OS?. Is your solution still working or you have found other tricks in the meantime?

I've been having the same problem with my new iMac since upgrade to El Capitan. ( Text bubble appears out of nowhere, showing numbers and strong phonetic characters, keyboard freezes, then repeats prior keystrokes until I close window.) Apple Care tech suggested PRAM reset. ( See instructions elsewhere on support.) This reset fixed the problem for 10 days or so, but it has since reappeared. Apple, please acknowledge that this is an OS bug and not some mechanical problem with the input device! Also, let us know if a fix in coming in the next update. Thanks.

cantb70,

Please create your own thread and someone will be happy to answer it. You may have similar symptoms but a totally different cause.

Sorry but no. They're not similar, they're identical. A new thread would be a disservice to others with the same problem.

Okay, well I have posted what I recommend follow the advice or create your own thread. Your call.

Same issue here. Restart fixes it for a day or two then the problem is back. Also having issues with the mouse jumping between selections in a menu...Late 2012 iMac

I'm having the exact same issue with my keyboard and it also started after upgrading to El Capitan.

To resolve the issue, I'm having to switch off the keyboard and switch it back on again. It's very inconvenient.

Looks like this issue has been caused by El Capitan. Hope that Apple recognises that this issue is now affecting a number of users and a fix is provided for the next software update.

I write again after a few trials on this issue. In particular, I tried the SMC and PRAM resets suggested by rkaufmann87 and they seem to work only for few days. The problem will come back sooner or later. For a temporary solution, the suggestion by Textalker48of switching off the keyboard for a few seconds works great. However, the problem is there and it is linked to the upgrade to El Capitan, there is little doubt about this. The last update of El Capitan did not solve it. Let's hope for the next one.

I forgot to add, that I experience this problem almost only when using mails and in particular when writing the email addresses.